diff --git a/content/treestyletab/treestyletab.js b/content/treestyletab/treestyletab.js
index a0cfaf77..b83e2376 100644
--- a/content/treestyletab/treestyletab.js
+++ b/content/treestyletab/treestyletab.js
@@ -1185,10 +1185,6 @@ var TreeStyleTabService = {
 	{
 		this.promoteTab(this.browser.selectedTab);
 	},
-	promoteTabs : function(aTabs)
-	{
-		aTabs.slice().reverse().forEach(this.promoteTab, this);
-	},
  
 	demoteTab : function(aTab) 
 	{
@@ -1203,10 +1199,6 @@ var TreeStyleTabService = {
 	{
 		this.demoteTab(this.browser.selectedTab);
 	},
-	demoteTabs : function(aTabs)
-	{
-		aTabs.forEach(this.demoteTab, this);
-	},
   
 /* Session Store API */